BY W. N. BENSOX, W. S. DIX, AND W. R. BROWXE. 361 



This form is rcpi-escnted by Specimen 4370 in the collection of the Geologi- 

 cal Survey, ()l)taine(l by Culleu from Moorowarra Parish, and another from 

 Carroll. 



Straparollus davidis, sp. nov. (Plate xxii., fig. 10.) 



Straparolhis, Moutfort, Conch. Syst., Vol. ii., 1810, p. 174. 

 The form is sub-discoid, and consists of five or six gently enlarging whorls 

 which are sub-circular in cross section, making a low spiral with an extremely broad 

 umbilicus. The shell is ornamented by transverse striae which cross the whorls 

 almost perpendicularly. The dimensions are: Height of spire, 7 mm.; diameter 

 of kase, 24 mm.; height of aperture, 5 mm.; breadth, (i mm.; (ingle of spire, 135°. 

 This form has no analogy among the Belgian Carboniferous forms described by 

 De Koninck, but is not unlike S. clymenoides (Hall) from the Devonian (Scho- 

 harie Grit and Helderberg Series) of the United States. The specimen upon 

 which this species has been instituted is No. F ] 773 in the collection of the Geo- 

 logical Survey, and was found at Carroll by Mr. J. G. Gritfin. We dedicate the 

 species to Professor David, F.R.S. 



Naticopsls brevispika (Ryckholt). (Plate xxii., fig. 8.) 

 P. de Ryckholt, .Melanges Palaeontol., Pt. i., 1847, p. 78, t. 3, f. 8, 9 {non 

 Roemer) ; De Koninck, Faune Calc. Carb. Beige, Pt. 3, 1881, p. 22, t. 1, 

 f. 23, 24, 25, 26. 



Several small specimens are available for examination. The spire has four 

 whorls ornamented with fine striae with the same sinuosity as is general for this 

 genus. The form agrees fairly closely with De Koninck's diagnosis, the following 

 being the dimensions of the largest example: Height of spire, 12 mm.; width, 14; 

 height of aperture, 10; width, 6; spiral angle, 135°. 



Soine callus occurs on the inner margin, but its tubercular nature cannot be 

 observed. In Belgium this form occurs in Stage VI. of the Carboniferous 

 Limestone at Vise. That chosen for illustration is No. 1814 of the Geological 

 Survey, and was obtained at Carroll. 



Naticopsis globosa (Hoeninghaus). (Plate xxii., figs. 15, 16.) 



Hoeninghaus, Verzeichniss des von E. W. Hoeninghaus dem Museum der Uni- 

 versitat Bonn uberlassen Petrifacten Sammelung, 1829, p. 8; De Kon- 

 inck. Faune Calc. Belg., Pt. 3, 1881. p. 15, t. 1, f. 1, 2, 8, 9, 10, 11; 

 t. 2, f. 25. 



Our specimens are the internal casts of three individuals, one of which has 

 been slightly flattened by crushing parallel to the spire. The spire is composed of four 

 or five whorls. The measurements of the two forms are as follows: — 



A. B. (flg-ured). 



Leng-th of spire 10 mm. 17 mm. 



Breadth 10 mm. 14 mm. 



Length of aperture 9 mm. 14 mm. 



Breadth 7 mm. flattened. 



Spiral angle 114° 110° 



This form' was collected by Mrs. Scott from the S.E. of Babbinboon, and 

 examples are Specimen No. F 12459 in the Museum of the Geological Survey, and 

 two others in the collection of the University of Sydney. 



